Vpliv ekstraktivov na naravno odpornost jedrovine kostanjevine (Castanea sativa Mill.)

diplomski projekt

Daša Krapež (Author), Primož Oven (Reviewer), Miha Humar (Mentor)

Abstract

Kostanjevino uvrščamo med najbolj naravno odporne slovenske lesne vrste. V literaturi zasledimo, da je najpomembnejši dejavnik naravne odpornosti kostanjevine vsebnost velikega deleža ekstraktivnih snovi. Želeli smo raziskati, kako na naravno odpornost kostanjevine vplivajo ekstraktivi in kakšen je njihov delež. Izdelali smo vzorce iz jedrovine pravega kostanja, izprali ekstraktive s 3 različnimi topili in vzorce izpostavili 5 glivam razkrojevalkam lesa: Gloeophyllum trabeum, Antrodia vaillantii, Pleurotus ostreatus, Trametes versicolor in Stereum hirsutum. Glivam razkrojevalkam smo izpostavili tudi neekstrahirane vzorce in kontrolne vzorce bukovine ter smrekovine. Izgubo mase po 12 tednih smo določili gravimetrično. Ugotovili smo, da se odpornost vzorcev jedrovine pravega kostanja proti glivam z delnim izpiranjem ekstraktivov bistveno ne zniža. Naravna odpornost je po ekstrakciji nekoliko slabša, vendar povezana z vsebnostjo ekstraktivov. Tudi ekstrahirana jedrovina pravega kostanja je dobro odporna proti glivam, neekstrahirano pa lahko uvrstimo v najvišji odpornostni razred (izguba mase okoli 1 %).

Keywords

les;pravi kostanj;naravna odpornost;glive razkrojevalke;ekstraktivi;

Data

Language:	Slovenian
Year of publishing:	2011
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[D. Krapež]
UDC:	630*841
COBISS:	1954441
Views:	998
Downloads:	378
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of extractives on durability of sweet shesnut heartwood (Castanea sativa Mill.)
Secondary abstract:	Sweet chestnut wood is considered as one of the most durable Slovenian domestic wood species. There are several reports that the most important factor influencing wood durability are extractives. To find out if sweet chestnut wood durability is based on extractives and their contents, specimens were extracted and exposed to 5 different fungal species: Gloeophyllum trabeum, Antrodia vaillantii, Pleurotus ostreatus, Trametes versicolor and Stereum hirsutum. A part of specimens was extracted with soxhlet extraction with 3 different solvents. Fungal decay was determined gravimetrically after 12 weeks of exposure. In parallel, Norway spruce and beech wood samples were exposed to the wood decay fungi as well. Our results indicate that influence of extractives on wood durability is important although natural durability of sweet chestnut heartwood specimens after extraction is not significantly lowered. It can be resolved that natural durability of non-extracted sweet chestnut heartwood can be classified as very durable against fungal decay (mass loss lower than 1 %).
Secondary keywords:	wood;sweet chesnut;natural durability;decay fungi;extractives;
Type (COBISS):	Diploma project paper
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	XII, 49 f.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	22012